TY - JOUR
T1 - Application of enzymatic calcification for dust control and rainfall erosion resistance improvement
AU - Sun, Xiaohao
AU - Miao, Linchang
AU - Yuan, Junhao
AU - Wang, Hengxing
AU - Wu, Linyu
N1 - Funding Information:
This study was funded by National Natural Science Foundation of China (grant number 51578147 ), Fundamental Research Funds for the Central Universities (grant number 2242020R20025 ) and Science and Technology Department of Ningxia (grant number 2020BFG02014 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/10
Y1 - 2021/3/10
N2 - Globally, most cities are facing severe challenges associated with dust pollution and it is of great significance to propose an effective and environmentally friendly dust control method. This study used enzymatically induced calcite precipitation (EICP) technology for dust control. Moreover, polyvinyl acetate (PVAc) was added to the cementation solution to improve its rainfall erosion resistance. The results showed that the optimum ratio of urease solution to cementation solution differed according to the concentrations of reactants in the cementation solution. Under combined EICP and PVAc (50 g/L) treatment, the stability of the dust-slope significantly improved. Moreover, little dust soil loss was washed out by simulated rainfall because of the more stable spatial structure of CaCO3 precipitation. Furthermore, PVAc addition increased the surface strength of slopes, while the cemented layer became thinner. With this combined EICP and PVAc (50 g/L) treatment, in a field test, the treated area of the slope had higher surface strengths and stronger erosion resistance than untreated areas. These higher surface strengths were attributed to the smaller particle size, and the stronger cementing effect of grass seeds. These results demonstrated that EICP-PVAc treatment significantly controlled dust and mitigated surface erosion of dust-slopes. This represents promising potential for the prevention of dust pollution.
AB - Globally, most cities are facing severe challenges associated with dust pollution and it is of great significance to propose an effective and environmentally friendly dust control method. This study used enzymatically induced calcite precipitation (EICP) technology for dust control. Moreover, polyvinyl acetate (PVAc) was added to the cementation solution to improve its rainfall erosion resistance. The results showed that the optimum ratio of urease solution to cementation solution differed according to the concentrations of reactants in the cementation solution. Under combined EICP and PVAc (50 g/L) treatment, the stability of the dust-slope significantly improved. Moreover, little dust soil loss was washed out by simulated rainfall because of the more stable spatial structure of CaCO3 precipitation. Furthermore, PVAc addition increased the surface strength of slopes, while the cemented layer became thinner. With this combined EICP and PVAc (50 g/L) treatment, in a field test, the treated area of the slope had higher surface strengths and stronger erosion resistance than untreated areas. These higher surface strengths were attributed to the smaller particle size, and the stronger cementing effect of grass seeds. These results demonstrated that EICP-PVAc treatment significantly controlled dust and mitigated surface erosion of dust-slopes. This represents promising potential for the prevention of dust pollution.
KW - Dust
KW - Enzymatically induced carbonate precipitation
KW - Polyvinyl acetate
KW - Rainfall erosion
KW - Stable structure
UR - http://www.scopus.com/inward/record.url?scp=85096995047&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.143468
DO - 10.1016/j.scitotenv.2020.143468
M3 - Journal article
C2 - 33277016
AN - SCOPUS:85096995047
SN - 0048-9697
VL - 759
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 143468
ER -